5911

5526

كارشناسي ارشد

ريخته گري

اصفهان: دانشگاه صنعتي اصفهان،دانشكده مواد

1389

ده،100ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

رحمت ا.. عمادي

بهزاد نيرومند

25/2/90

مرتضي شمعانيان، مهدي احمديان

مهندسي مواد

ID5526

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Fabrication of Aluminum matrix composites by infiltration route into preform ceramic Reza Mardanpour R mardanpour@ma iut ac ir Date of Submission 2010 06 19 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Rahmatallah Emadi remadi@cc iut ac ir Abstract Recently the demands for lightweight materials having high strength and high stiffness have attracted much interest in the development of the fabrication processes for metal matrix composites MMCs In this research is focused on Al2O3 alloy aluminum A356 composite obtained via infiltration by squeeze casting into porous ceramics of aluminum oxide Al2O3 Applied pressures for infiltration melt aluminum into perform of alumina were 50 75 100 and 125 MPa under casting temperatures 700 750 and 800 C The microstructural features mechanical properties and wear characteristics of the composites and alloy were investigated The results indicated that a homogenous distribution of Al2O3 particle in the aluminum matrix which is almost free of pores can be obtained by squeeze casting method The size of the Al phase and eutectic silicon phase decreased with increasing applied pressure Higher strength and lower wear rates were observed in the composite materials than the unreinforced aluminum alloy part However a marked decrease in ductility of the composites arising from adding of perform of alumina was obtained By increase in applied pressure from 50 to 100 MPa at 700 C yield strength and ultimate compression strength in the composite include 20 Vol alumina preform were up 15 and 26 respectively Also in the composite include 25 Vol alumina preform yield strength and ultimate compression strength were up to 25 and 4 8 respectively In the applied pressure more than 125 MPa happened crushing of alumina preform consequently decreased the mechanical properties The fracture surface of the Al2O3 A356 composite include 20 Vol alumina showed brittle fracture characteristics on the fracture surfaces of the composite broken and cleaved alumina preform were observed and the cracks were initiated in the brittle eutectic silicon phase Keywords Composite Aluminum Squeeze Casting Alumina Yield Strength Wear

رحمت ا.. عمادي

بهزاد نيرومند

مرتضي شمعانيان، مهدي احمديان